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.\" ========================================================================
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.\" ========================================================================
.\"
.IX Title "Test::Warnings 3"
.TH Test::Warnings 3 "2024-01-23" "perl v5.32.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
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.SH "NAME"
Test::Warnings \- Test for warnings and the lack of them
.SH "VERSION"
.IX Header "VERSION"
version 0.033
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    use Test::More;
\&    use Test::Warnings;
\&
\&    pass(\*(Aqyay!\*(Aq);
\&    done_testing;
.Ve
.PP
emits \s-1TAP:\s0
.PP
.Vb 3
\&    ok 1 \- yay!
\&    ok 2 \- no (unexpected) warnings (via done_testing)
\&    1..2
.Ve
.PP
and:
.PP
.Vb 2
\&    use Test::More tests => 3;
\&    use Test::Warnings 0.005 \*(Aq:all\*(Aq;
\&
\&    pass(\*(Aqyay!\*(Aq);
\&    like(warning { warn "oh noes!" }, qr/^oh noes/, \*(Aqwe warned\*(Aq);
.Ve
.PP
emits \s-1TAP:\s0
.PP
.Vb 4
\&    ok 1 \- yay!
\&    ok 2 \- we warned
\&    ok 3 \- no (unexpected) warnings (via END block)
\&    1..3
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
If you've ever tried to use Test::NoWarnings to confirm there are no warnings
generated by your tests, combined with the convenience of \f(CW\*(C`done_testing\*(C'\fR to
not have to declare a
test count,
you'll have discovered that these two features do not play well together,
as the test count will be calculated \fIbefore\fR the warnings test is run,
resulting in a \s-1TAP\s0 error. (See \f(CW\*(C`examples/test_nowarnings.pl\*(C'\fR in this
distribution for a demonstration.)
.PP
This module is intended to be used as a drop-in replacement for
Test::NoWarnings: it also adds an extra test, but runs this test \fIbefore\fR
\&\f(CW\*(C`done_testing\*(C'\fR calculates the test count, rather than after.  It does this by
hooking into \f(CW\*(C`done_testing\*(C'\fR as well as via an \f(CW\*(C`END\*(C'\fR block.  You can declare
a plan, or not, and things will still Just Work.
.PP
It is actually equivalent to:
.PP
.Vb 1
\&    use Test::NoWarnings 1.04 \*(Aq:early\*(Aq;
.Ve
.PP
as warnings are still printed normally as they occur.  You are saf